Heat reversible gel-like lubricating composition, process for producing the same, and bearing lubricant and bearing system using said composition

Abstract

A heat reversible gel-like lubricating composition having such properties that, in a service bulk temperature region, the composition is in a semi-solid gel form as with grease, but in a local high-temperature region such as a sliding contact site, the composition is homogeneously melted, is free from grease, i.e., the precipitation of foreign materials, exhibits excellent low frictional characteristics unrealizable by grease, and exhibits significant energy saving properties. The heat reversible gel-like lubricating composition includes a mineral oil and/or synthetic liquid lubricating base oil and a bisamide and/or a monoamide and has heat reversible gel properties. Preferably, the heat reversible gel-like lubricating composition contains a triamide and further contains, based on 100 parts by weight of the liquid lubricating base oil, 0.01 to 500 parts by weight in total of a bisamide and a monoamide and 0.05 to 10 parts by weight of a friction regulator.

1 - 13 . (canceled) 
   
   
       14 . A heat reversible gel-like lubricating composition comprising a mineral and/or synthetic liquid base oil for lubricant and a bisamide and/or a monoamide and having characteristics of a heat reversible gel. 
   
   
       15 . The composition according to  claim 14 , further comprising a triamide. 
   
   
       16 . The composition according to  claim 14 , wherein the amount of the bisamide and/or the monoamide is 0.01 to 500 parts by weight in total per 100 parts by weight of the liquid base oil for lubricant. 
   
   
       17 . The composition according to  claim 14 , further comprising 0.05 to 10 parts by weight of friction modifier per 100 parts by weight of the liquid base oil for lubricant. 
   
   
       18 . A method for preparing a heat reversible gel-like lubricating composition comprising blending a bisamide and/or a monoamide capable of forming a heat reversible gel to a mineral and/or a synthetic liquid base oil for lubricant. 
   
   
       19 . The method according to  claim 18 , further comprising blending a triamide. 
   
   
       20 . The method according to  claim 18 , wherein the amount of the bisamide and/or the monoamide is 0.01 to 500 parts by weight in total per 100 parts by weight of the liquid base oil for lubricant. 
   
   
       21 . The method according to  claim 18 , further comprising blending 0.05 to 10 parts by weight of a friction modifier per 100 parts by weight of the liquid base oil for lubricant. 
   
   
       22 . A lubricant for bearings comprising the heat reversible gel-like lubricating composition according to  claim 18 . 
   
   
       23 . The lubricant for bearings according to  claim 22 , wherein the lubricant is used for an oil-impregnated bearing. 
   
   
       24 . The lubricant for bearings according to  claim 22 , wherein the lubricant is used for a rolling bearing. 
   
   
       25 . A bearing system using the lubricant for bearings according to  claim 22 . 
   
   
       26 . A method for producing a bearing system comprising a step of heating the lubricant for bearings according to  claim 22  together with an oil-impregnated bearing.